Process for carburizistg iron or steel



UNITED STATES PATENT OFFICE.

SAMUEL S. EVELAND, 0F BRYN MAWR, PENNSYLVANIA, ASSIGNOR' T0 EVELAND ELECTRIC RIVETER COMPANY, A CORPORATION OF NEW JERSEY.

PROCESS FOR QARBURIZING IRON OR STEEL.

No Drawing.

To all whom it may concern:

Be it known that I, SAMUEL S. EVELAND, of Br 11 Mawr, in the county of Montgomery and tate of Pennsylvania, have invented certain new and useful Improvements in Processes for Carburizing Iron or Steel, whereof the following is a specification.

My invention relates to those processes, ordinarily referred to as case-hardening or cementation processes, whereby carbon is caused to penetrate the surface of, and pass into iron or steel thereby increasing the carbon content of the metal; the extent of such penetration depending upon the conditions under which the process is conducted and the nature of agent employed. It is epiphar encable not only to the ordinary case-h ing processes, as heretofore practised, but also to those cementation processes by which large masses or plates of metal are carburized.

My invention depends upon the discovery which consists in heating it in the of a carburizing a cut which I have found more efficient in ylelding up itscarbon to the metal, and causing it to penetrate there in, than any other substances which have heretofore been used for this purpose.

I have found that by using a vegetable substance containing a sufiicient'arnount of carbon and also containing a nitrogenous constituent, I am able to secure the superior results to which I have referred. :As an example of a vegetable substance which fulfilsthese conditions, I will specify the pulpy matter whichremains after the sugar has been extracted from beet. This refuse of the beetsugarindustry is readilypbtainable and consists of 'a fibrous mass w ch may be dried. It pontains, in. addition to carbohydrates, a considerable quantity (say over Specification of Letters Patent.

Application filed April 12, 1910.

Patented Mar. 30, 1915. Serial No. 554,935.

burization which is more uniform and of greater depth is obtained in less time than by the use of other materials which have heretofore been employed forjhis purpose.

Theexact nature of the chemical re-actibn that takes place is not fully understood by me, but 1 believe that the nitrogenous content in the vegetable matter which is employed is the agent which effects the more easy and uniform penetration of the carbon into the metal.

1 claim 1. The process'of carburizing iron or steel, resence of fibrous vegetable Waste depleted ofstarchy matter, but containing carbohydrates and a high percentage of protein,

2. The process of treating iron or low carbon steel for carburization, whichconsists in placing the iron or steel in proximity to the fibrous refuse from the manufacture of sugar, in "a closed receptacle and heating the same.

In testimony whereof, I have, hereunt; signed my name at Philadelphia, Pennsyl- Vania, this eleventh day of April, 1910.

SAMUEL' S. EVELAND.

Witnesses:

JAMES H. BELL, ELIZABETH A. Reeve. 

